More emphasis in SA (of last section we did)
We know asteroids and comets are able to wipe out life from planets
In 5 billion years the sun will run out of fuel and die
What life on earth has in common: its all based on DNA
What is life?
Homeostasis, organization, metabolism, growth, adaptation, response to
stimuli, reproduction get a cell
We don’t really know what constitutes life
Where can life live?
Why did we form from carbon which is less abundant than silicon?
silicon makes 4 bonds like carbon
- we don’t know where it could survive (things made of silicon) so we don’t
know where to look, so we look for things tha